#BlueforSudan was a social-media movement that began in Sudan in June 2019 after the death of Mohamed Mattar (Arabic: محمد مطر, romanized: Muḥammad Maṭar), who was shot dead during the Khartoum massacre, a government crackdown on peaceful protesters during the Sudanese Revolution. The movement aimed to raise awareness about the situation in Sudan and show solidarity with the protesters by turning social media platforms blue using the hashtag, resulting in widespread national and international condemnation, which led to an official investigation into the Khartoum massacre.